Chapter 24

When two species of orchids with different floral anatomy are considered, which type of reproductive barrier is involved?
Select one:
a. gametic
b. temporal
c. behavioral
d. habitat
e. mechanical
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mechanical

What was the species concept used by Linnaeus?
Select one:
a. biological
b. ecological
c. paleontological
d. phylogenetic
e. morphological

morphological

What is generally true of two sibling species?
Select one:
a. They are the result of anagenesis.
b. They are unable to produce hybrid offspring upon interbreeding.
c. Their reproductive isolation from each other is complete.
d. Genes are unable to pass from one sibling species’ gene pool to the other’s.
e. They shared a common ancestor recently in evolutionary time.

When two species of meadowlarks with different mating songs are considered, which type of reproductive barrier is involved?
Select one:
a. gametic
b. temporal
c. behavioral
d. habitat
e. mechanical

behavioral

Some species of Anopheles mosquito live in brackish water, some in running fresh water, and others in stagnant water. What type of reproductive barrier is most obviously separating these different species?
Select one:
a. temporal isolation
b. behavioral isolation
c. postzygotic isolation
d. gametic isolation
e. habitat isolation

habitat isolation

A defining characteristic of allopatric speciation is
Select one:
a. the appearance of new species in the midst of old ones
b. artificial selection
c. geographic isolation
d. asexually reproducing populations
e. large populations

geographic isolation

A rapid method of speciation that has been important in the history of flowering plants is
Select one:
a. genetic drift
b. a mutation in the gene controlling the timing of flowering
c. polyploidy
d. paedomorphosis
e. behavioral isolation

polyploidy

Which of the following statements about species, as defined by the biological species concept, is (are) correct? I. Biological species are defined by a group of organisms that can successfully interbreed with each other.II. Biological species are the model used for grouping extinct forms of life.III. The biological species is the largest unit of population in which homologous structures can be identified.
Select one:
a. II only
b. I only
c. II and III
d. I, II, and III
e. III only

For which species concept is anatomical features the primary criterion for determining species identities? 1. biological 2. ecological 3. morphological 4. phylogenetic
Select one:
a. 2 only
b. 4 only
c. 1 only
d. 1 and 2
e. 3 only